Ribas, Camila C.; Miyaki, Cristina Y. (2004). "Molecular systematics in Aratinga parakeets: species limits and historical biogeography in the 'solstitialis' group, and the systematic position of Nandayus nenday". Molecular Phylogenetics and Evolution. 30 (3). ss.663-75. doi:10.1016/S1055-7903(03)00223-9. PMID15012946.
Ribas, Camila C.; Miyaki, Cristina Y. (2004). "Molecular systematics in Aratinga parakeets: species limits and historical biogeography in the 'solstitialis' group, and the systematic position of Nandayus nenday". Molecular Phylogenetics and Evolution. 30 (3). ss.663-75. doi:10.1016/S1055-7903(03)00223-9. PMID15012946.